【作者】 马强；

【导师】 徐玉琴；

【作者基本信息】 华北电力大学（河北） ， 电力系统及其自动化， 2007， 硕士

【摘要】 在我国，多种中性点接地方式共存于6～35kV配电网中。随着自动调谐消弧线圈技术的发展与完善，谐振接地方式的应用越来越广泛。谐振接地方式有效的解决了配电网单相接地故障电容电流的补偿问题，提高了电网的供电连续性和可靠性。但在接地故障选线、暂态过电压、对地电容测量精度和方法适应性等方面仍存在问题。本文的工作是致力于解决这些问题。 本文对中压配电网中性点接地方式，尤其是谐振接地方式进行了深入的分析，提出了中性点柔性接地方案。通过大量的仿真分析，证明了这种接地方式对配电网发生单相接地故障后的故障检测和抑制暂态过电压有很好的效果，具有较高的应用价值。本文对传统的电网对地电容电流测量方法进行了分析，指出了各种测量方法存在的局限性。提出了基于注入信号法的测量配电网电容电流的新原理，并完成了测量装置的理论分析和软硬件设计。更多还原

【Abstract】 In our country, lots of neutral ground method are used in the 6～35kV distribution grids. Of these methods, resonance ground technique is used mostly. But, there are also some problems which have not been settled in the resonance ground system. By a lot of analyses for the medium-voltage distribution networks with different neutral ground techniques, the disadvantages of neutral resonance grounded mode and neutral flexible grounded mode have been proposed by in-depth analyses in this paper. The theoretical analysis and a great deal of simulations have shown the advantages of the new program on limiting the over-voltage of single-phase ground fault, restraining excessive remnant current and detecting faults.Traditional methods for measuring capacitive phase-to-earth current in distribution networks which has been analyzed in this paper. Their drawbacks are presented also. A new method for measuring the capacitive current by injecting signals has been educed in this paper. The hardware and software designs for measuring device have been finished in the paper.更多还原